CN216171403U - Desulfurization and denitrification treatment system - Google Patents
Desulfurization and denitrification treatment system Download PDFInfo
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- CN216171403U CN216171403U CN202122711394.XU CN202122711394U CN216171403U CN 216171403 U CN216171403 U CN 216171403U CN 202122711394 U CN202122711394 U CN 202122711394U CN 216171403 U CN216171403 U CN 216171403U
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Abstract
The utility model discloses a desulfurization and denitrification treatment system for kiln flue gas on a ferronickel production line, which comprises a desulfurization absorption tower, a first bag-type dust remover, a flue gas heat exchanger, a flue gas heater, a denitrification reactor and an induced draft fan, wherein the first bag-type dust remover is arranged on the top of the desulfurization absorption tower; the flue gas heater is used for heating fluid entering the flue gas heater to a temperature to be denitrated; the induced draft fan can make the ferronickel flue gas follow behind desulfurization absorption tower, first sack cleaner, gas heater, denitration reactor, induced draft fan in proper order the chimney discharges. The utility model can realize the ultralow emission of the flue gas and reduce the energy consumption of the desulfurization and denitrification operation.
Description
Technical Field
The utility model relates to the field of metallurgical environmental protection, in particular to a desulfurization and denitrification treatment system for kiln flue gas on a nickel-iron alloy production line.
Background
In order to improve the environment and reduce pollution, the nickel-iron flue gas needs to be subjected to desulfurization and denitrification advanced treatment, and is discharged after reaching the ultralow discharge standard.
The temperature of the ferronickel flue gas is about 85-120 ℃, the conventional low-temperature denitration needs to arrange a flue gas generating furnace to generate high-temperature flue gas to be mixed with the ferronickel flue gas so as to meet the temperature requirement of a denitration reactor, and a large amount of energy is consumed to increase the temperature of the flue gas.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the utility model is to provide a desulfurization and denitrification treatment system for kiln flue gas on a nickel-iron alloy production line, which can realize ultralow emission of flue gas and reduce the energy consumption of desulfurization and denitrification operation.
The specific technical scheme in the embodiment of the utility model is as follows:
a desulfurization and denitrification treatment system comprising:
the system comprises a desulfurization absorption tower, a first bag-type dust collector, a flue gas heat exchanger, a flue gas heater, a denitration reactor and an induced draft fan;
the outlet of the desulfurization absorption tower is connected with the first bag-type dust collector;
the inlet of the first bag-type dust remover is connected with the desulfurization absorption tower, and the outlet of the first bag-type dust remover is connected with the flue gas heat exchanger;
a raw flue gas inlet of the flue gas heat exchanger is connected with the first bag-type dust collector, and a raw flue gas outlet of the flue gas heat exchanger is connected with the flue gas heater;
the inlet of the flue gas heater is connected with the flue gas heat exchanger, and the outlet of the flue gas heater is connected with the denitration reactor;
the inlet of the denitration reactor is connected with the flue gas heater, and the outlet of the denitration reactor is connected with the clean flue gas inlet of the flue gas heat exchanger;
the inlet of the induced draft fan is connected with the clean flue gas outlet of the flue gas heat exchanger, and the outlet of the induced draft fan is used for being connected with a chimney;
the flue gas heater is used for heating fluid entering the flue gas heater to a temperature to be denitrated;
the induced draft fan can make the ferronickel flue gas follow behind desulfurization absorption tower, first sack cleaner, gas heater, denitration reactor, induced draft fan in proper order the chimney discharges.
In a preferred embodiment, the desulfurization and denitrification treatment system further includes: a heat-taking heat exchanger, a multi-tube dust remover and a circulating fan,
the heat-taking heat exchanger is connected with the flue gas heater through a communicating pipeline, the inlet end of the heat-taking heat exchanger is connected with the multi-pipe dust remover, and the outlet end of the heat-taking heat exchanger is connected with the circulating fan; a circulating pump is arranged on the communicating pipeline;
one end of the multi-tube dust remover is connected with the heat taking heat exchanger, and the other end of the multi-tube dust remover is used for connecting high-temperature flue gas;
one end of the circulating fan is connected with the heat taking heat exchanger;
the circulating fan can make part of high-temperature flue gas behind the ferronickel flue gas heating furnace sequentially circulate through the multi-pipe dust remover, the heat-taking heat exchanger and the circulating fan and return to the flue gas heating furnace,
the circulating pump can enable the heat conduction oil to sequentially and circularly flow through the heat taking heat exchanger, the smoke heater and the circulating pump to exchange heat with smoke flowing through the smoke heater.
In a preferred embodiment, the communication pipeline includes a liquid outlet pipe and a liquid return pipe, and the circulation pump is disposed on the liquid return pipe, or the circulation pump is disposed on the liquid outlet pipe.
In a preferred embodiment, the liquid return pipe is also communicated with an expansion tank.
In a preferred embodiment, the circulation pump is used for providing a driving force for heat conducting oil, and after the circulation pump is started, the heat conducting oil can form heat conducting oil circulation among the heat taking heat exchanger, the liquid outlet pipe, the flue gas heater and the liquid return pipe.
In a preferred embodiment, the heat-taking heat exchanger further comprises a hollow body, a heat-conducting oil heated tube is arranged in the hollow body, one end of the heat-conducting oil heated tube is a heat-conducting oil inlet, and the other end of the heat-conducting oil heated tube is a heat-conducting oil outlet.
In a preferred embodiment, the denitration reactor adopts a low-temperature denitration catalyst, the denitration temperature is 200 ℃, and the temperature to be denitrated is higher than 200 ℃.
In a preferred embodiment, the desulfurization and denitrification processing system is applied to a ferronickel production line, the ferronickel production line comprises a submerged arc furnace, a finished product rotary kiln, a flue gas heating furnace for heating flue gas generated by the submerged arc furnace and the finished product rotary kiln, and a semi-finished product rotary kiln and a second bag-type dust collector which are arranged between the flue gas heating furnace and the desulfurization absorption tower along the flow direction of the flue gas.
In a preferred embodiment, the other end of the circulating fan is connected to the inlet end of the flue gas heating furnace, and the other end of the multi-tube dust collector is connected to a pipeline between the flue gas heating furnace and the semi-finished rotary kiln.
In a preferred embodiment, the induced draft fan is a variable frequency induced draft fan, the desulfurization and denitrification treatment system further comprises a controller, and the controller can adjust working parameters of the circulating fan according to the temperature change of the heat conduction oil.
In a preferred embodiment, the desulfurization and denitrification treatment system further includes: the device comprises a flow sensor for detecting the flow of the heat transfer oil, a first temperature sensor for acquiring the outlet temperature of the heat transfer oil, a second temperature sensor for acquiring the inlet temperature of the heat transfer oil, a third temperature sensor for acquiring the inlet flue gas temperature of the heat taking heat exchanger and a fourth temperature sensor for acquiring the outlet flue gas temperature of the heat taking heat exchanger.
In a preferred embodiment, the flue gas heater is a flue gas generator, and the flue gas generator is used for generating high-temperature flue gas.
Technological process the technical scheme of the utility model has the following remarkable beneficial effects:
the desulfurization and denitrification treatment system for the kiln flue gas on the ferronickel production line realizes ultralow emission of the flue gas and reduces the energy consumption of desulfurization and denitrification operation on the premise of ensuring the production of the ferronickel process, and has a plurality of advantages and practical values.
Utilize heat exchanger to retrieve ferronickel production line hot-blast furnace exhanst gas outlet high temperature waste heat and directly be used for heating denitration system flue gas, realized that the direct high-efficient recovery of energy is utilized. On the whole, the desulfurization and denitration treatment system for the kiln flue gas on the ferronickel production line has the advantages of high desulfurization and denitration efficiency, safety, reliability, low operation cost and the like.
Particularly, the heat conduction oil is adopted as a heat taking medium, the high-temperature flue gas generated by the ferronickel production line is utilized, the flue gas temperature is reduced through the heat taking heat exchanger through heat convection, the generated high-temperature heat conduction oil is directly used for a flue gas heater, the flue gas temperature is increased through the heat convection of the flue gas heater, the temperature requirement of the denitration reactor is met, and the temperature of the heat conduction oil is reduced at the same time, so that the circulation is realized.
In addition, the heat conduction oil is used as a heat taking medium, the heat conduction oil is always in a stable liquid state in the heat taking process, vaporization cannot occur, and compared with a hot water medium, the conditions of scaling, local vapor blockage and the like under the influence of water quality do not exist, so that the long-term safe operation of a waste heat exchange system is guaranteed.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the utility model may be employed. It should be understood that the embodiments of the utility model are not so limited in scope. The embodiments of the utility model include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the utility model as a matter of case.
Fig. 1 is a schematic diagram of a desulfurization and denitrification treatment system for kiln flue gas in a ferronickel production line provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a desulfurization and denitrification treatment system for kiln flue gas in another ferronickel production line provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a heat extraction heat exchanger provided in an embodiment of the present application.
Reference numerals of the above figures:
1. a submerged arc furnace; 2. a high temperature flue gas line; 3. finished product rotary kiln 4, flue gas heating furnace; 5. a semi-finished product rotary kiln; 6. a second bag-type dust collector; 7. a desulfurization absorption tower; 8. a first bag-type dust collector; 9. a flue gas heat exchanger; 10. a flue gas heater; 11. a denitration reactor; 12. an induced draft fan; 13. a chimney; 14. a multi-tube dust collector; 15. a heat-taking heat exchanger; 150. a heat conducting oil heated tube; 151. a heat conducting oil inlet; 152. a heat conducting oil outlet; 16. a circulating fan; 17. a circulation pump; 18. a liquid outlet pipe; 19. an expansion tank.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to fig. 2 together, in an embodiment of the present application, a system for desulfurization and denitration treatment of kiln flue gas in a ferronickel production line is provided, including: the system comprises a desulfurization absorption tower 7, a first bag-type dust collector 8, a flue gas heat exchanger 9, a flue gas heater 10, a denitration reactor 11 and an induced draft fan 12.
The outlet of the desulfurization absorption tower 7 is connected with the first bag-type dust collector 8; the inlet of the first bag-type dust collector 8 is connected with the desulfurization absorption tower 7, and the outlet of the first bag-type dust collector 8 is connected with the flue gas heat exchanger 9; a raw flue gas inlet of the flue gas heat exchanger 9 is connected with the first bag-type dust collector 8, and a raw flue gas outlet of the flue gas heat exchanger 9 is connected with the flue gas heater 10; the inlet of the flue gas heater 10 is connected with the flue gas heat exchanger 9, and the outlet of the flue gas heater 10 is connected with the denitration reactor 11; the inlet of the denitration reactor 11 is connected with the flue gas heater 10, and the outlet of the denitration reactor 11 is connected with the clean flue gas inlet of the flue gas heat exchanger 9; an inlet of the induced draft fan 12 is connected with a clean flue gas outlet of the flue gas heat exchanger 9, and an outlet of the induced draft fan 12 is used for being connected with a chimney 13; the flue gas heater 10 is used for heating the fluid entering the flue gas heater to the temperature to be denitrated. The induced draft fan 12 can make the ferronickel flue gas follow behind desulfurization absorption tower 7, first sack cleaner 8, gas heater 9, flue gas heater 10, denitration reactor 11, induced draft fan 12 in proper order the chimney 13 discharges.
In this embodiment, a desulfurization and denitrification treatment system for kiln flue gas on a ferronickel production line is provided, which realizes ultralow emission of flue gas and reduces the energy consumption of desulfurization and denitrification operation on the premise of ensuring the production of the ferronickel process, and has many advantages and practical values.
The following detailed description is to be read with reference to the drawings and detailed description.
As shown in fig. 1, the desulfurization and denitrification treatment system may include: the system comprises a desulfurization absorption tower 7, a first bag-type dust collector 8, a flue gas heat exchanger 9, a flue gas heater 10, a denitration reactor 11 and an induced draft fan 12. In addition, it also includes: a heat-taking heat exchanger 15, a multi-pipe dust remover 14 and a circulating fan 16.
The heat taking heat exchanger 15 is connected with the flue gas heater 10 through a communicating pipeline, the inlet end of the heat taking heat exchanger 15 is connected with the multi-tube dust remover 14, and the outlet end of the heat taking heat exchanger 15 is connected with the circulating fan 16; a circulating pump 17 is arranged on the communicating pipeline; one end of the multi-tube dust remover 14 is connected with the heat taking heat exchanger 15, and the other end of the multi-tube dust remover is used for connecting high-temperature flue gas; one end of the circulating fan 16 is connected with the heat taking and exchanging device 15; the circulating fan 16 can make partial high-temperature flue gas behind the ferronickel flue gas heating furnace 4 circulate through the multi-pipe dust remover 14, the heat-taking heat exchanger 15 and the circulating fan 16 in sequence and return to the flue gas heating furnace 4. The circulating pump 17 can make the heat conducting oil circularly flow through the heat taking heat exchanger 15, the flue gas heater 10 and the circulating pump 17 in sequence to exchange heat with the flue gas flowing through the flue gas heater 10.
The desulfurization and denitrification treatment system for the kiln flue gas on the ferronickel production line has the advantages of high desulfurization and denitrification efficiency, safety, reliability, low operation cost and the like.
In this embodiment, it adopts the conduction oil as getting hot media, utilizes the high temperature flue gas that ferronickel production line produced, reduces the flue gas temperature through getting hot heat exchanger 15 convection heat transfer, produces high temperature conduction oil simultaneously and directly is used for flue gas heater 10, reduces through flue gas heater 10 convection heat transfer and improves the flue gas temperature and reach denitration reactor 11 temperature requirement, reduces the conduction oil temperature simultaneously to this circulation. The heat conducting oil is used as a heat taking medium, the heat conducting oil is always in a stable liquid state in the heat taking process, vaporization cannot occur, and compared with a hot water medium, the conditions of scaling, local vapor blockage and the like under the influence of water quality do not exist, and the long-term safe operation of a waste heat exchange system is guaranteed.
In this specification, a desulfurization and denitrification system is mainly applied to a ferronickel production line as an example for explanation.
When the desulfurization and denitrification processing system is applied to a ferronickel production line, the ferronickel production line comprises a submerged arc furnace 1, a finished product rotary kiln 3, a flue gas heating furnace 4 for heating flue gas generated by the submerged arc furnace 1 and the finished product rotary kiln 3, and a semi-finished product rotary kiln 5 and a second bag-type dust collector 6 which are arranged between the flue gas heating furnace 4 and the desulfurization absorption tower 7 along the flow direction of the flue gas. The submerged arc furnace 1 and the flue gas heating furnace 4, and the finished product rotary kiln 3 and the flue gas heating furnace 4 can be communicated through high-temperature flue gas pipelines 2.
The other end of the circulating fan 16 is connected to the inlet end of the flue gas heating furnace 4, and the other end of the multi-tube dust collector 14 is connected to a pipeline between the flue gas heating furnace 4 and the semi-finished rotary kiln 5.
The induced draft fan 12 can make the ferronickel flue gas pass through desulfurization absorption tower 7, first sack cleaner 8, gas heater 9, flue gas heater 10, denitration reactor 11, induced draft fan 12 and chimney 13 in proper order and discharge.
The circulating fan 16 can make partial high-temperature flue gas behind the ferronickel flue gas heating furnace 4 circulate through the multi-pipe dust remover 14, the heat-taking heat exchanger 15 and the circulating fan 16 in sequence and return to the flue gas heating furnace 4.
The circulation pump 17 is a heat transfer oil circulation pump 17 for providing a driving force for the heat transfer oil, and the heat transfer oil can sequentially and circularly flow through the heat extraction heat exchanger 15, the flue gas heater 10 and the circulation pump 17. The flue gas heater 10 and the heat extraction heat exchanger 15 can exchange heat between the heat conducting oil and the flue gas, as shown in fig. 1.
Flue gas that ferronickel production line produced passes through the flue and gets into desulfurization system, and desulfurization system includes desulfurization absorption tower 7 and first sack cleaner 8.
In the present embodiment, the specific connection relationship of the respective portions is as follows:
the flue gas outlet of desulfurization absorption tower 7 is connected with the flue gas inlet of first sack cleaner 8, the flue gas outlet of first sack cleaner 8 is connected with the former flue gas inlet of flue gas heat exchanger 9, the former flue gas outlet of flue gas heat exchanger 9 is connected with the flue gas inlet of flue gas heater 10, the flue gas outlet of flue gas heater 10 is connected with the flue gas inlet of denitration reactor 11, the flue gas outlet of denitration reactor 11 is connected with the clean flue gas inlet of flue gas heat exchanger 9, the clean flue gas outlet of flue gas heat exchanger 9 is connected with the inlet of draught fan 12, the export of draught fan 12 is connected with the inlet of chimney 13.
Flue gas of the multi-tube dust remover 14 is taken to an outlet flue of the flue gas warming furnace 4, a flue gas outlet of the multi-tube dust remover 14 is connected with a flue gas inlet of the heat taking heat exchanger 15, a flue gas outlet of the heat taking heat exchanger 15 is connected with an inlet of the circulating fan 16, and an outlet of the circulating fan 16 is connected to a flue gas hood of the flue gas warming furnace 4.
The heat conducting oil outlet 152 of the heat taking heat exchanger 15 is connected with the heat conducting oil inlet of the flue gas heater 10, the heat conducting oil outlet 152 of the circulating pump 17 is connected with the inlet of the circulating pump 17, and the outlet of the circulating pump 17 is connected with the heat conducting oil inlet of the heat taking heat exchanger 15.
A communication pipeline is arranged between the heat extraction heat exchanger 15 and the flue gas heater 10, and the communication pipeline comprises a liquid outlet pipe 18 and a liquid return pipe. The circulating pump 17 is arranged on the liquid return pipe, or the circulating pump 17 is arranged on the liquid outlet pipe 18.
As shown in fig. 3, the heat-taking heat exchanger 15 further includes a hollow body, a heat-conducting oil heated tube 150 is disposed in the hollow body, one end of the heat-conducting oil heated tube 150 is a heat-conducting oil inlet 151, and the other end is a heat-conducting oil outlet 152. The heat conducting oil inlet 151 is connected with a liquid return pipe, and the heat conducting oil outlet 152 is connected with the liquid outlet pipe 18 to form a heat conducting oil circulating system.
The desulfurization and denitrification treatment system for the kiln flue gas on the ferronickel production line further comprises an expansion tank 19. The expansion vessel 19 may be arranged on the outlet pipe 18. The heat conducting oil outlet 152 of the circulating pump 17 can be connected with the inlet of the expansion tank 19 through the liquid outlet pipe 18.
In the embodiment, the heat conduction oil is used as a heat taking medium, the heat conduction oil is always in a stable liquid state in the heat taking process, vaporization cannot occur in the heat taking heat exchanger 15, the conditions of local steam blockage and the like do not exist, heating is uniform, and long-term operation of equipment is guaranteed.
In particular, the heat transfer oil can be synthesized by adopting T66 with the operation temperature of 345 ℃. Of course, the heat-taking medium may be other heat medium, for example, a hot water + constant pressure system may be adopted, but water is easily vaporized, and relatively no heat-conducting oil is stable.
In another embodiment, as shown in figure 2, the flue gas heater 10 may be in the form of a flue gas generator. When the flue gas heater 10 is a flue gas generating furnace, the flue gas generating furnace is used for generating high-temperature flue gas. Specifically, the flue gas generating furnace can be provided with a first inlet A for introducing natural gas or other energy media, a second inlet B for introducing combustion air, and an outlet for leading out high-temperature flue gas generated by combustion. In particular, the outlet may be connected between the flue gas heat exchanger 9 and the denitrification reactor 11.
The desulfurization and denitrification system mainly comprises two parts, namely a desulfurization system part and a denitrification system part. The desulfurization adopts a dynamic reaction zone method semidry method flue gas desulfurization technology, flue gas with the temperature of about 85-120 ℃ enters a flue gas inlet at the upper part of a desulfurization absorption tower 7 through a flue, the flue gas and a desulfurizing agent are in parallel flow from top to bottom in the desulfurization absorption tower 7 and are fully contacted and reacted, the desulfurized dust-containing flue gas is led out from a flue gas outlet at the lower part of the desulfurization absorption tower 7, enters a desulfurizing agent connecting flue, then enters a first bag-type dust collector 8, and the separated and purified flue gas enters a denitration system.
The denitration system adopts a process route of 'flue gas after desulfurization + GGH + hot water flue gas heater 10+ low-temperature SCR + induced draft fan 12'. And the denitration adopts a Selective Catalytic Reduction (SCR) process. This deNOx systems includes: a flue gas heat exchanger 9, a flue gas heater 10, a denitration reactor 11 and an induced draft fan 12. Wherein, the denitration reactor 11 adopts a low-temperature denitration catalyst, the denitration temperature is 200 ℃, and the temperature to be denitrated is higher than 200 ℃.
The flue gas with the temperature of about 75 ℃ after desulfurization enters a flue gas heat exchanger 9 through a flue; the denitrated flue gas flowing out of the denitration reactor 11 is used for heating the 75 ℃ low-temperature flue gas to 175 ℃ after being desulfurized and dedusted, and then the flue gas is heated to 220 ℃ by the flue gas heater 10 and enters the denitration system. Clean flue gas at the outlet of the denitration system is cooled to 90 ℃ through a flue gas heat exchanger 9 and then is discharged into a chimney 13 through a draught fan 12 in a pressurizing mode and is discharged outwards.
The application provides be used for the desulfurization of kiln flue gas to take off a round pin processing system on the ferronickel production line, under the prerequisite of guaranteeing ferronickel technology production, realized the ultralow emission of flue gas and reduced SOx/NOx control operation energy consumption, have a lot of advantages and practical value. On the whole, the desulfurization and denitration treatment system for the kiln flue gas on the ferronickel production line has the advantages of high desulfurization and denitration efficiency, safety, reliability, low operation cost and the like.
Particularly, heat conduction oil is used as a heat taking medium, high-temperature flue gas generated by a ferronickel production line is utilized, the temperature of the flue gas is reduced through convection heat exchange of the heat taking heat exchanger 15, the generated high-temperature heat conduction oil is directly used for the flue gas heater 10, the temperature of the flue gas is increased through the convection heat exchange of the flue gas heater 10 to meet the temperature requirement of the denitration reactor 11, and the temperature of the heat conduction oil is reduced at the same time, so that the circulation is realized.
In addition, the heat conduction oil is used as a heat taking medium, the heat conduction oil is always in a stable liquid state in the heat taking process, vaporization cannot occur, and compared with a hot water medium, the conditions of scaling, local vapor blockage and the like under the influence of water quality do not exist, so that the long-term safe operation of a waste heat exchange system is guaranteed.
Based on the desulfurization and denitrification treatment system provided in the above embodiment, the present application also provides a process method of the desulfurization and denitrification treatment system, and the process method may include the following steps:
step 1: by utilizing a dynamic reaction zone method semidry method flue gas desulfurization technology, the flue gas with the temperature of 85-120 ℃ enters a desulfurization absorption tower 7 through a flue;
step 2: leading the desulfurized dust-containing flue gas out of the desulfurization absorption tower 7, entering a first bag-type dust remover 8, and separating and purifying by the first bag-type dust remover 8;
and step 3: introducing the desulfurization and dust removal flue gas separated and purified by the first bag-type dust collector 8 into a flue gas heat exchanger 9, and heating the desulfurization and dust removal flue gas to a first temperature by using the denitrated flue gas flowing out of a denitration reactor 11;
and 4, step 4: heating the flue gas heated to the first temperature to a second temperature by the flue gas heater 10, and then entering the denitration reactor 11 for denitration treatment;
and 5: and introducing the flue gas subjected to denitration treatment into the flue gas heat exchanger 9 for cooling, and then discharging the flue gas into a chimney 13 through an induced draft fan 12.
The process method of the desulfurization and denitrification system provided by the application corresponds to the desulfurization and denitrification system and mainly comprises two parts, namely a desulfurization part and a denitrification part. The desulfurization adopts a dynamic reaction zone method semidry method flue gas desulfurization technology, flue gas with the temperature of about 85-120 ℃ enters a flue gas inlet at the upper part of a desulfurization absorption tower 7 through a flue, the flue gas and a desulfurizing agent are in parallel flow from top to bottom in the desulfurization absorption tower 7 and are fully contacted and reacted, the desulfurized dust-containing flue gas is led out from a flue gas outlet at the lower part of the desulfurization absorption tower 7, enters a desulfurizing agent connecting flue, then enters a first bag-type dust collector 8, and the separated and purified flue gas enters a denitration system.
The denitration system adopts a process route of 'flue gas after desulfurization + GGH + hot water flue gas heater 10+ low-temperature SCR + induced draft fan 12'. And the denitration adopts a Selective Catalytic Reduction (SCR) process. This deNOx systems includes: a flue gas heat exchanger 9, a flue gas heater 10, a denitration reactor 11 and an induced draft fan 12. Wherein, the denitration reactor 11 adopts a low-temperature denitration catalyst, the denitration temperature is 200 ℃, and the temperature to be denitrated is higher than 200 ℃.
The flue gas with the temperature of about 75 ℃ after desulfurization enters a flue gas heat exchanger 9 through a flue; the denitrated flue gas flowing out of the denitration reactor 11 is used for heating the 75 ℃ low-temperature flue gas to 175 ℃ after being desulfurized and dedusted, and then the flue gas is heated to 220 ℃ by the flue gas heater 10 and enters the denitration system. Clean flue gas at the outlet of the denitration system is cooled to 90 ℃ through a flue gas heat exchanger 9 and then is discharged into a chimney 13 through a draught fan 12 in a pressurizing mode and is discharged outwards.
Further, the process method of the desulfurization and denitrification treatment system also comprises the following steps:
step 6: acquiring the flow rate of the heat conduction oil, the temperature difference of the heat conduction oil inlet and outlet and the temperature difference of the flue gas flowing through the heat taking heat exchanger 15 and then passing through the outlet;
and 7: determining the target flue gas flow based on the obtained flow of the heat conducting oil, the temperature difference of the heat conducting oil inlet and outlet and the temperature difference of the flue gas flowing through the heat taking heat exchanger 15 and then passing through the outlet;
and 8: and adjusting the working parameters of the circulating fan 16, and matching the actual flue gas flow with the target flue gas flow.
Wherein, be used for the SOx/NOx control processing system of kiln flue gas on this ferronickel production line to get heat exchanger 15 and adopt the conduction oil to retrieve ferronickel production line hot-blast furnace exhanst gas outlet high temperature waste heat as heat transfer medium and directly be used for heating denitration system flue gas, realized that the direct high-efficient of energy is retrieved and is utilized.
Taking high-temperature flue gas at 450-650 ℃ at the outlet of a submerged arc furnace 1 of a ferronickel production line as a heat source, taking out part of the high-temperature flue gas at the outlet of a flue gas heating furnace 4, dedusting the high-temperature flue gas by a multi-pipe deduster 14, then feeding the high-temperature flue gas into a heat taking heat exchanger 15, carrying out indirect heat exchange on heat conduction oil and the flue gas in the heat taking heat exchanger 15, and raising the temperature of the heat conduction oil from 200 ℃ to 230 ℃ after the heat conduction oil absorbs heat in the heat taking heat exchanger 15; the temperature of the flue gas is reduced to about 250 ℃ after heat release, the flue gas is pressurized by the circulating fan 16 and then returned to the flue gas heating furnace 4 inlet flue gas cover, the circulating fan 16 adopts frequency conversion adjustment, the flue gas amount is adjusted according to the temperature of the heat conduction oil outlet 152, so that the flue gas amount can be accurately controlled, the temperature of the heat conduction oil can be accurately increased, the temperature of the flue gas flowing through the flue gas heater 10 can be accurately increased, and the temperature of the flue gas subsequently entering the denitration reactor 11 can reach the denitration temperature.
Wherein, the regulation principle of this flue gas volume is based on the energy conservation principle: q flue gas flow rate and CP flue gas specific heat rate (T inlet flue gas temperature-T outlet flue gas temperature) and Q heat transfer oil flow rate and CP heat transfer oil specific heat rate (T1 heat transfer oil outlet 152 temperature-T2 heat transfer oil inlet 151 temperature).
The heat conduction oil heated to 230 ℃ is introduced to a denitration area through a communication pipeline, exchanges heat with denitration inlet flue gas through a flue gas heater 10 in a denitration system, heats the outlet flue gas temperature of a flue gas heat exchanger 9 from 175 ℃ to 220 ℃ and enters a denitration reactor 11; the heat transfer oil releases heat in the flue gas heater 10, the temperature is reduced to 200 ℃, the heat transfer oil returns to the heat extraction heat exchanger 15 again through the circulating pump 17, and forced circulation of heat transfer oil waste heat recovery is achieved, as shown by arrows in fig. 1.
It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.
The above embodiments are only a few embodiments of the present invention, and the embodiments of the present invention are described above, but the present invention is only used for the understanding of the present invention, and is not limited to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (12)
1. A desulfurization and denitrification treatment system, comprising:
the system comprises a desulfurization absorption tower, a first bag-type dust collector, a flue gas heat exchanger, a flue gas heater, a denitration reactor and an induced draft fan;
the outlet of the desulfurization absorption tower is connected with the first bag-type dust collector;
the inlet of the first bag-type dust remover is connected with the desulfurization absorption tower, and the outlet of the first bag-type dust remover is connected with the flue gas heat exchanger;
a raw flue gas inlet of the flue gas heat exchanger is connected with the first bag-type dust collector, and a raw flue gas outlet of the flue gas heat exchanger is connected with the flue gas heater;
the inlet of the flue gas heater is connected with the flue gas heat exchanger, and the outlet of the flue gas heater is connected with the denitration reactor;
the inlet of the denitration reactor is connected with the flue gas heater, and the outlet of the denitration reactor is connected with the clean flue gas inlet of the flue gas heat exchanger;
the inlet of the induced draft fan is connected with the clean flue gas outlet of the flue gas heat exchanger, and the outlet of the induced draft fan is used for being connected with a chimney;
the flue gas heater is used for heating fluid entering the flue gas heater to a temperature to be denitrated;
the induced draft fan can make the ferronickel flue gas follow behind desulfurization absorption tower, first sack cleaner, gas heater, denitration reactor, induced draft fan in proper order the chimney discharges.
2. The desulfurization and denitrification treatment system according to claim 1, further comprising: a heat-taking heat exchanger, a multi-tube dust remover and a circulating fan,
the heat-taking heat exchanger is connected with the flue gas heater through a communicating pipeline, the inlet end of the heat-taking heat exchanger is connected with the multi-pipe dust remover, and the outlet end of the heat-taking heat exchanger is connected with the circulating fan; a circulating pump is arranged on the communicating pipeline;
one end of the multi-tube dust remover is connected with the heat taking heat exchanger, and the other end of the multi-tube dust remover is used for connecting high-temperature flue gas;
one end of the circulating fan is connected with the heat taking heat exchanger;
the circulating fan can make part of high-temperature flue gas behind the ferronickel flue gas heating furnace sequentially circulate through the multi-pipe dust remover, the heat-taking heat exchanger and the circulating fan and return to the flue gas heating furnace,
the circulating pump can enable the heat conduction oil to sequentially and circularly flow through the heat taking heat exchanger, the smoke heater and the circulating pump to exchange heat with smoke flowing through the smoke heater.
3. The desulfurization and denitrification treatment system according to claim 2, wherein the communication line comprises a liquid outlet pipe and a liquid return pipe, and the circulation pump is disposed on the liquid return pipe, or the circulation pump is disposed on the liquid outlet pipe.
4. The desulfurization and denitrification treatment system according to claim 3, wherein an expansion tank is further communicated with the liquid return pipe.
5. The desulfurization and denitrification treatment system of claim 3, wherein the circulating pump is used for providing a driving force for heat conducting oil, and after the circulating pump is started, the heat conducting oil can form heat conducting oil circulation among the heat taking heat exchanger, the liquid outlet pipe, the flue gas heater and the liquid return pipe.
6. The desulfurization and denitrification treatment system according to claim 3, wherein the heat-taking heat exchanger further comprises a hollow body, a heat-conducting oil heated pipe is arranged in the body, one end of the heat-conducting oil heated pipe is a heat-conducting oil inlet, and the other end of the heat-conducting oil heated pipe is a heat-conducting oil outlet.
7. The desulfurization and denitrification treatment system of claim 1, wherein the denitrification reactor uses a low-temperature denitrification catalyst, the denitrification temperature is 200 ℃, and the temperature to be denitrated is higher than 200 ℃.
8. The desulfurization and denitrification processing system according to claim 2, wherein the desulfurization and denitrification processing system is applied to a ferronickel production line, and the ferronickel production line comprises a submerged arc furnace, a finished product rotary kiln, a flue gas heating furnace for heating flue gas generated by the submerged arc furnace and the finished product rotary kiln, a semi-finished product rotary kiln and a second bag-type dust collector which are arranged between the flue gas heating furnace and the desulfurization absorption tower in the flow direction of the flue gas.
9. The desulfurization and denitrification treatment system according to claim 8, wherein the other end of the circulating fan is connected to the inlet end of the flue gas temperature increasing furnace, and the other end of the multi-tube dust collector is connected to a pipeline from the flue gas temperature increasing furnace to the semi-finished rotary kiln.
10. The desulfurization and denitrification treatment system of claim 6, wherein the induced draft fan is a variable frequency induced draft fan, and the desulfurization and denitrification treatment system further comprises a controller, wherein the controller can adjust working parameters of the circulating fan according to temperature changes of the heat transfer oil.
11. The desulfurization and denitrification treatment system according to claim 10, further comprising: the device comprises a flow sensor for detecting the flow of the heat transfer oil, a first temperature sensor for acquiring the outlet temperature of the heat transfer oil, a second temperature sensor for acquiring the inlet temperature of the heat transfer oil, a third temperature sensor for acquiring the inlet flue gas temperature of the heat taking heat exchanger and a fourth temperature sensor for acquiring the outlet flue gas temperature of the heat taking heat exchanger.
12. The desulfurization and denitrification processing system of claim 1, wherein the flue gas heater is a flue gas generator, and the flue gas generator is used for generating high-temperature flue gas therein.
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| CN202122711394.XU CN216171403U (en) | 2021-11-08 | 2021-11-08 | Desulfurization and denitrification treatment system |
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| CN202122711394.XU CN216171403U (en) | 2021-11-08 | 2021-11-08 | Desulfurization and denitrification treatment system |
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| CN216171403U true CN216171403U (en) | 2022-04-05 |
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2021
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